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MANUPAGTURB 0F COILED METALLIC PIPES.

No. 276,763. l Patented May 1,1883. a

AUA.

UNITED STATES PAT-ENT (DFFICE.

ALVA D. BROCK, F.WASHINGTON, DISTRICT OF COLUMBIA.`

MANUFACTURE OF COILED 4METALLIC PlPES.

SPECIFICATION forming part of Letters Patent No. 276,763, dated May 1, 1883. Application filed December 23,1882. (No model.)

To all whom it may concern Be it known that I, ALVAN D. BROCK, a citizen of the United States, residing at Washington,\inthe District of Columbia, havel invented certain new and useful Improvements in the Manufactue of Uoiled Metallic Pipes; and I do declare the-following to `be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters andiigures of reference marked thereon, which form apartof this speciication. l

Figure 1 of the drawings represents a rear elevation, and Fig. 2 a plan of a device by which my improvement may be carried out.

tions hereinafter statedand described.

Heretofore it has been difficult, if not impossible, to bend coupled lengths of pipe, as gas-pipe, dto., for the reason that if bent while cold the pipe would break at the point where the screw-threads are cut. If heated, the expansion of the couplingl causes a displacement of the screw-threads, and a good joint is therefore seldom obtained. I have devised amethod of coiling pipes, preferably without heating, which removes the objection.

It has heretofore been difficult to make helical or spiral coils, especially iiat or faked coils, with a space between the separate bends of the pipe for the passage of heat, Ste., when such coils are used in steam-boilers and heaters.- I have devised a method and appliances by which the distances between the bends may be perfectly regulated and a superior coil produced.

I will proceed to describe a machine by which my process may be carried out.

A represents a suitable frame.

B is a plate or disk, made to rotate at the desired speed by suitable driving` mechanism, as the shaft C and a train of gears leading` back to driving-pulley D.-

E is a hub of the size which the innermost bend of thecoil is desired to be. Interchangeable hubs will be used to determine the size of the interior of coils.

convenient, and they are movable on the'face of plate B, so as to be inserted in holes b.

F is guide-pulley, against which the pipes i are rested While being fed to the machine.

J is a stripl of rubber or leather belting, or it may bea chain of iron or other metal, which is to 'be Wound in with the tubes in the process of bending or coiling,`and is of such thickness as to give the desired spacing between the bends ofthe coil when the strip is removed.

H is the pipe or tube. This pipe is clamped on the disk or plate B, and when the plate is put in rotation the pipe is wound up about the hub E, the strip J being Wound in with it. The pipe may be Wound in flat fakes, as shown in Fig. 2, or in a spiral, as at IVI, Fig. 6, or in a different lengths of threaded pipe together in the process of coiling.

When the pipe has been coiled nearly to the end of a section a mandrel, as K, is inserted in the end of that and the next section of pipe. This mandrel may have a collar, as it, around it, to prevent its passing too far into either length or joint of pipe, .and it should be a little longer than the threaded sleeve I. The two pipes having been-coupled with the mandrel in the adjacent ends, the coiling is continued until the coupling has been passed for a shortdistauce, the-mandrel serving to take the strain from the pipe and coupling. As soon as the IOO portion of its inside surface, as shown, the two ends' projecting over the pipes beyond the part on which the screw-threads are cut. In either case the coupling-sleeve and the pipe within 5 it do not bend much, if at all, and so much of the coil as forms the coupling does not form a true curve.

I do not herein claim the cold-bent coil produced by the method described7 reserving the 1o right to claim the same in a separate applica` tion.

What I claim is- 1. A device for ceiling metal pipes, which consists essentially of a disk or plate on which 1 5 the pipes rest, a clamp for holding the pipe uponthe disk, and a iexible strip which is interposed between the bends of the pipe as the work progresses, substantially as described.

2. The improvement in the art or method of 2o coiling pipe with spaces between the bends, which consists in the interposition of a spacing strip during the process of bending, substantially as described.

3. The improvement in art or method of 25 bending pipe in sections, which consists of a principal `and intermediate step or steps, the former consisting in winding the pipe in coils, and the latter in supporting` the ends of the pipe-sections to be united, so as to take off the strain incident to the operation of coiling, sub- 3o stantially as set forth.

4. The improvement in the artor method of ceiling pipes in sections, which consists essentially in the insertion of a mandrel in the ends of the pipes while bending, and afterward re- 3 5 moving the mandrel from the coil, substantially as described.

5. The improvement in the art or method of coilimg` pipes in sections, which consists inwinding the pipe in coils with an interposed fleXi- 4o ble strip, and supporting the pipe within the coupling during the operation of ceiling, substantially as described. Y

In testimony whereof I affix my signature in presence of two witnesses.

. ALvAN D. BROCK. Witnesses:

F. B. BROOK,

W. T. JOHNSON. 

